Coelurosauravus were small, lizard-like diapsid reptiles, native to the Permian period and resembling green iguanas or other modern day lizards. It had specialized wing-like structures allowing it to glide.

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Coelurosauravus were approximately the same size as a human arm but slightly larger, with a long, streamlined body resembling that of some modern lizards. Coelurosauravus' body possessed two large, wing-like structures, which allowed it to achieve powered flight and gliding around its environment in the air. Due to the arid Permian climate of their home time, Coelurosauravus would be unused to the modern day's cooler, seasonal climate and preferred high temperatures, and were dangerously vulnerable to freezing temperatures.

Coelurosauravus appeared to live in small flocks together in their home time, although some of them could be more solitary or stray off. They also communicated with varying chirping vocalisations, and they apparently had an unusually long memory span for reptiles (over a year at least). Despite Coelurosauravus being cold-blooded reptiles, at least one, Rex, was shown to be unusually active, intelligent and curious; although it is unknown if this is a common characteristic for Coelurosauravus or if Rex's behaviour was atypical.

Coelurosauravus (name meaning "Hollow lizard grandfather") was a basal diapsid reptile genus, which was 30-50 cm in length approx. It lived in what is now Madagascar, England and Germany, during the Upper Permian period. Coelurosauravus possessed wing-like structures (dermal bones with skin stretched over them) and a long and flat body, allowing it to glide.